diff --git a/.github/workflows/checker-scaling.yml b/.github/workflows/checker-scaling.yml
index 37003d6..1e1fd6b 100644
--- a/.github/workflows/checker-scaling.yml
+++ b/.github/workflows/checker-scaling.yml
@@ -36,7 +36,7 @@ jobs:
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Setup Rust
-        uses: dtolnay/rust-toolchain@02cb101ec7c40f2c49e1d9714d64511d8e1b74de # stable
+        uses: dtolnay/rust-toolchain@7e38f4b43b4db5c8dd498af069a4f6196df1d067 # stable
         with:
           toolchain: stable
       - name: Run allocation-scaling harness
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index c291beb..3cef55b 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -48,7 +48,7 @@ jobs:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Setup Rust
-        uses: dtolnay/rust-toolchain@02cb101ec7c40f2c49e1d9714d64511d8e1b74de # stable
+        uses: dtolnay/rust-toolchain@7e38f4b43b4db5c8dd498af069a4f6196df1d067 # stable
         with:
           toolchain: stable
           components: llvm-tools-preview
diff --git a/.github/workflows/stack-depth.yml b/.github/workflows/stack-depth.yml
index 2549f7a..09a439c 100644
--- a/.github/workflows/stack-depth.yml
+++ b/.github/workflows/stack-depth.yml
@@ -42,7 +42,7 @@ jobs:
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Setup Rust
-        uses: dtolnay/rust-toolchain@02cb101ec7c40f2c49e1d9714d64511d8e1b74de # stable
+        uses: dtolnay/rust-toolchain@7e38f4b43b4db5c8dd498af069a4f6196df1d067 # stable
         with:
           toolchain: stable
       - name: Stack-depth regression test (#37 subtleties 1 & 3)